What was the population of US 1n 1861?

459,218,156,357,186,387,186,358,795,413,875,153,851,135,153,897,845,892,156,111,687,635,489,354,156,789,654,321,159,753,657,489,325,651,687,523,594,287,348,915,346,846,852,741,369,164