Which nation was the world's economic leader after world war 1 a. germany b. the united states c. german americans d "irreconcilables"

your list doesn't mention any of them at all.

and what does "these" mean anyway ?

president thomas jefferson hoped that the embargo act of 1807 would the united states by demonstrating to britain and france their dependence on american goods, convincing them to respect american neutrality and stop impressing american seamen. instead, the act had a devastating effect on american trade.