hall. every crowd that would take him. them that he owed them is best judgment, not obedience. he did not just when the wonublican nomination, he the demographic -- the democratic nomination. explorer american history tv every weekend on c-span3. the c-span cities tour travels the country exploring taking book story, tv and american history tv on thirdad every first and weekend of the month to learn about history and literary life. our tour continues as we visit detroit.

bailey: the link of the city of detroit in the city of windsor is not just a link -- it is a story of two nations. there is 16 billion dollars of trade per year for both countries. rely on this, so it is a tremendously important part of our history and has been since pre-civil war. during prohibition, detroit was responsible for bringing in 75% of all illegal alcohol, and of course, our neighbors from the south, windsor in canada. was still city, usa, and we were not only transporting the raw materials, but the

finished materials. there were days in the 1860's when you had 7000 to 10,000 waiting to be transported. they would have to wait for ferries to take them to canada or vice versa and that backlog made the conversation about a tunnel or a bridge take the national front front -- forefront by the 1870's. we had to wait about this dissertation that is very slow because ferries can only transport 5270 cars at a time. 70 cars at a time. we need an infrastructure that can support taking from candidate and getting to detroit's and vice versa and that means building the tunnel and later the bridge. so we have two tunnels. one is for train transport.

completed in 1910, it took four years to build. hoover30, president presses a button that rings a bell in detroit and across the river in windsor that destroyed -- that opens the detroit-windsor tunnel. it's the first nation connecting tunnel in the world in it has been working seamlessly since that time. it had a $50 million renovation in the 1990's, but it sees almost 10,000 cars a day. 90%ransports mainly people, cars, 2% trucks. it can be everything from iphones to baby food to tomato soup. if it's made in america, it goes through that tunnel pending not hazardous or explosive material.

in 1922, the detroit river was the busiest freshwater shipping tunnel in the world. it still is today. things are transported throughout the entire world. on freighter maps. there's not a continent we don't touch. the ambassador bridge was completed on november 15, 1929. when it opened, it was the longest extension bridge in the world and it holds that record for about four months before it's taken. it allows shipments of traitor traffic.der the bridge itself was completed by one man.

he builds the bridge as an economic driver. it is a toll bridge. .t is owned by individual means 10,000's in my trucks is the main transport for canada intorom michigan. we see everything from gerber baby foods to kellogg cereal. again, as the two biggest international trading partners in the world you can imagine the depth and scope of what's traveling the bridge. ambassador bridge opens and then in 1930 when the tunnel opens they are heralded as engineering marvels.

the tobacco that makes ours cigar manufacturing flourish, bringing in the raw iron.and take but there's also funny parts of our history. when the bridge opens, we are at the height of prohibition. it gets the name be detroit -windsor funnel because of the amount of alcohol being funneled . we have to have these methods of transport or we will be stuck going back to post civil war theories. it causes great spikes in the green.for products like the impact of opening three transit routes between two

countries is monumental to the beautician.oit's it plays intoub, our reputation. , we areears previous able to become a hub of industry and today we are still known as the motor city. it's really vital to the prosperity of the region. when you look at the legalities a border crossing, it is rife with issues of national security.

in the 1930's and 1940's, people used to picnic under the ambassador bridge. post 9/11 security concerns have meant that that is all closed on and the closest you can get is about 150 yards. it also has meant we have to be aware of illegal trafficking. they are border protected by border security. we also have coast guard stations that monitor the traffic coming across, making sure that what comes into the city is legal. it is tireless work. its enforcement across multiple agencies. crossing, order security, michigan state police, detroit police, all of whom have to work sure whattion to make

is traveling across the river into our city is safe. >> there are train tunnels that -- we area huge part building a new bridge span called the gordie howe .nternational bridge crossing as we travel through the next 100 years, we will try to influence production and manufacturing and coupled with that, the work of those finished goods and raw materials. anotherce of creating manufacturing marvel, those titles simply cannot be made in detroit says the river is not long enough. speaks to thely idea that we will create more

innovation with our modern-day ridges. -- bridges. join us every first and third weekend of the month as c-span takes american history tv on the road as we explore the american story. coming up between now and the withf the year we continue visits to ohio, michigan, colorado, indiana, and many more and you can watch videos from any of our stops by going to c-span.org/cities tour. american history tv products are now available at the online c-span store. see what is new for american history tv and check out all of the new c-span products. on american history tv,

senior archivist randy thompson delivers an illustrated talk showcasing resources available to the public at the national archives branch in riverside, california. items include records and artifacts dating back to 1775. the friends of the north hollywood library hosted this event. we are glad that you are here with us today to learn, maybe for the first time, about the national archives, a unique institution that is our nations recordkeeper. nationals are archivists. they have driven out here from riverside to inspire us to investigate and utilize our nation's archives. we have documents going back to 1775. and