. >> 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