What was discovered in the 1940s that showed people that there was an advanced civilization located in
Southern Mexico?

the answer is b.

hope this !

president jefferson protested this interference in american trade. he sent james monroe to london to negotiate a treaty. jefferson wanted britain to stop taking sailors from american ships, and to stop interfering in the trade of neutral nations. monroe tried many times to discuss such an agreement. but the british foreign minister was always too busy to see him.

explanation:

thomas jefferson is the answer

how is this a question? but yes, they were. if i recall correctly, it was very handy for native americans to use buffalo skin.