Travel diminished after 1860, as the Civil War caused considerable disruptions on the trail. Many of the people on the trail in 1861–1863 were fleeing the war and its attendant drafts in both the south and the north. Trail historian Merrill J. Mattes has estimated the number of emigrants for 1861–1867 given in the total column of the above table. But these estimates may well be low since they only amount to an extra 125,000 people, and the 1870 census shows that over 200,000 additional people (ignoring most of the population increase in California, which had excellent sea and rail connections across Panama by then) showed up in all the states served by the Bozeman, California, Mormon, and Oregon Trail(s) and their offshoots.