Answer:
Explanation:
The classical heritage of Rome, the customs of various Germanic tribes and the belief of the Roman Catholic Church were the three roots of medieval culture in Western Europe.
Britian had many rivers and sea ports
There were lots of foreign changes that presented challenges for the US. I'll give you a few examples from different time periods. First would be when England wanted to tax the Americans in the Revolutionary period. They did this to try and restrict America's freedom. Another example would be that Russia had spies during the cold war period. This was to gain intelligence of the US war plans. Also when Germany sent the Zimmerman Telegram to Mexico during the WWII period. This was to get Mexico to launch a surprise attack on the US.
