next, on the presidency, matthew costello talked about his new book "the property of the nation: george washington's tomb, mount vernon, and the memory of the first president." hey talks about how this helped historical narrative of the first president. he is a historian at the white house historical association west -- which hosted this event. >> good evening everyone. the house historical association, i would like to welcome our friends joining us by c-span and those who are here with us tonight who are the really smart people in washington, d.c., because you have chosen to be here above the nationals' baseball game and above the televised presidential debate tonight. we think we have got the best thing going here and we are glad you chose to be with

. >> you can watch archival next, matthew costello talks about his new book "the property of the nation: george washington's tomb, and the memory of the first president." we hear about the way americans celebrated george washington in the 19th century. and he talks about how the freed and enslaved people on washington's mount vernon estate elped shape the historical narrative. mr. costello is a historian at the association which hosted this event. r. costello: good evening, everyone.

matthew costello talked about his new book "the property of the nation: george washington's tomb, mount vernon, and the memory of the first president." we hear about the ways that americans remembered and celebrated george washington in

matthew costello talked about his new book "the property of the nation: george washington's tomb, mount vernon, and the memory of the first president." we hear about the ways that americans remembered and celebrated george washington in the 19th century. and he talked about how the freed and enslaved people on washington's mount vernon estate helped shape the historical narrative about the first president. mr. costello is a historian at the white house historical association, which hosted this event. >> good evening everyone. the house historical association , i would like to welcome our friends joining us by c-span and those who are here with us tonight who are the really smart people in washington, d.c., because you have chosen to be here above the nationals' baseball game and above the televised presidential debate tonight. we think we have got the best thing going here and we are glad you chose to be with us. i would like to acknowledge some very important people who are with us this evening. parents, tim and debbie wife.lo, and his and sophia and theodore guess are at home. wonderf

. >> you can watch archival next, matthew costello talks about his new book "the property of the nation: george washington's tomb, and the memory of the first president." we hear about the way americans celebrated george washington in the 19th century. and he talks about how the freed and enslaved people on washington's mount vernon estate elped shape the historical narrative. mr. costello is a historian at the association which hosted this event. r. costello: good evening, everyone. there we go. i would like to welcome our friends who are joining us by c-span and those who are here with us tonight who are the really smart people in ashington because you have chosen to be above the nationals game and about the presidential debate. we're glad you chose to be with us tonight. i'd like to acknowledge some very important people who are with us this evening. matt's parents tim and debbie costello who are here with us tonight and his wife kristen who is here tonight. and of course, in my book, the two most important costello are sofia and theodore. and they're at hope. they can come next time