the year that united states government stop recognizing the treaties created since the american revolution is 1871
The US thought they could wear down the Vietcong with high casualties but the Vietcong saw the battle as a fight for their lives so they didn't wear down easily. Hope this helps!
Answer: the invention of cotton gin
Explanation:The cotton gin refers to a a machine that sets aside cotton fibers from their seeds. Therefore, the invention of the cotton gin transformed the cotton industry in the United States and demanded cheap labor force, which led to the rise of slavery in the South and to the American Civil War later.
