<span>Spain in the 1500s, when they traded with the Native Americans some play toys....</span>
The correct answer is: "America passes the Neutrality Acts of<u> 1935, 1936, 1937, and 1939</u> which put restrictions on Americans during war".
The Neutrality Acts were enacted in the 1930s decade to limit the participation of the US in future wars, after its participation on WWI, which had brought an intense feeling of disillusionment.
Such acts banned trade and financial operations with belligerents, as it was believed that economic operations with the allied powers had pushed the US into WWI, and the US government aimed to prevent the same mistakes again.
This term was known as popular sovereignty and resulted in debate over many decades in both State legislatures and the United States congress. It led to tension across the free and slave states, even leading to a event known as Bleeding Kansas in which the residents would determine whether to be free or slave
