What early trade disadvantage did pre-columbian civilizations such as the maya, aztec, and inca have?

texas governor sam houston opposed secession, but was unable to prevent it. in this speech, given prior to lincoln's election, he presents the argument that slavery would be safer within the united states than outside of it. it was a prescient argument, and one held by several other southern leaders.

have a good day pls vote me brailyest

because he had a big bear belly