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.
There was no other reason for the Intolerable Acts other than to punish the colonists for what they were already doing.
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The greatest ancient civilization of Mesoamerica is the Olmec civilization. It left a rich and influential heritage in architecture, the arts and agriculture to the following cultures of the region: the Mayas, the Toltecs, the Aztecs. In their historical accounts, there is special mention of the old people of the Olmecs and their culture and ways.
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Smallpox may have become a worldwide epidemic.
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