In The Game of Uncle Sam's Mail, players crisscross the United States using all but which of these transportation methods?

Answer Hot-air balloon

Here's your chance to play that classic American hero, the postal worker! Released at the height of railroad mania in 1893, The Game of Uncle Sam's Mail was a celebration of American industry and progress (that also happened to teach kids a little geography). Unfortunately, 1893 also marked the start of the largest economic depression the country had experienced up to that point: the Panic of 1893. The primary cause of the collapse? Railroad overbuilding. By mid-1894, 25% of U.S. railroads were bankrupt.

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