The earliest introduction of zebra mussels in united states probably occurs in 1986.
At that time, commercial vessels from Europe went to north America as a place for freshwater ballast stowaway. They merchants then introduced zebra mussels to the market and it gained popularity ever since. They also introduced zebra mussels population in local lakes and let them reproduce there.
The role of the Supreme court is to interpret the constitution. If you need more clarification, i will be happy to elaborate.
Agriculture and animal husbandry.
The people could now live in one place. The rich and fertile land and rivers produced a surplus of food and water.
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B. The Europeans brought diseases like smallpox, and many Native Americans died.