In 1823, the what act emerged, stating among other things that europeans should not interfere with american nations.

The correct answer is:

The Monroe Doctrine.

The Monroe Doctrine was a United States policy that opposed European colonialism in the Americas. It declared that farther attempts by European countries to take control of an independent state in North or South America would be seen as hostile.

At the same time, the U.S. would acknowledge and not interpose with existing European colonies neither interfere in the internal affairs of European countries.

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

the correct answer is:

b) a rich merchant.