Belgium, the Netherlands, Denmark, Switzerland and Austria have a combined area of about 240,288 square kilometres, whereas Peru is about 1,285,000 square kilometres.
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They felt that dictators would lead their nations to war against their neighbors.
It would entangle the United States too deeply in the foreign affairs of European nations.
During the Civil War, the south sought help from European nations, especially Great Britain. They asked for support with men, weapons, etc. They though the plan would work because it was quite equivalent to the American Revolution, but European nations ultimately denied any support.
Great Britain and France
At the Berlin Conference of 1884-1885 the European nations decided on how they would divide up the ownership of Central Africa to avoid fighting over it. The conference didn't actually approve the territorial claims of the European nations, but they did agree on a set of rules to avoid conflict in partitioning of the region.
neutrality prolamation
The effects of a russian invasion on Ukraine would be negative economic on Eastern European nations.
No. In fact, if they retain their combined volume, their surface area would increase.
that European nations would have to alert one another about any African territory they claimed.
Interfere in Eastern European nations to preserve communist rule
The European Union is an organisation, not a place, so it does not have a size to compare with. It does have countries as members and if you take the combined area of those countries then the US would be bigger.