Answer:
The answer would be North America as well as France which is why we later became allies with England. This coming from an american. So, yes North America and France would be the answer your looking for really hope this helped you. :)
The domino theory was a Cold War concept that predicted that a communist administration in one country would swiftly lead to communist takeovers in adjacent countries, with each domino falling in a perfectly lined row.
Austria-Hungarian became two separate countries.
1) To warn European Powers not to get involved with the affairs of the Western Hemisphere. That the Western Hemisphere would not further be colonized by Europeans, and the U.S. would leave existing Colonies alone; not involved in their International affairs or wars.
2) President James Monroe wanted to make sure that Europe did not take Spain's colonies, as many were on the verge of their own independence. Prussia, Austria, and Russia had formed the Holy Alliance with the goal of defending monarchical government. It was a precaution really.
3) The United States was prosperous, as we no longer had to worry about wars, we could focus on trade to gain a better economy. Also the Europeans benefited from the fact that they could not stand another war and win, due to previous wars which had left them disorganized and slowly building back the economy.
hope this helps
<span />