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Number 2, Example A: Checks and balances: Example B: Separation of powers.

Explanation: Since congress has to pass laws that are given to them or proposed, and the Supreme Court can invalidate laws that violate the constitution, its a system of checks and balances and separation of powers. The separation of powers comes from the fact that only congress can pass new laws. The Supreme Court, judicial branch, et cetera cannot pass laws.

native american contribution: the patriots from britain learn how to hunt, fish, and introduce diversity within cultures.

african americans: indirectly introduced the idea of diversity to americans. africans coming to america because of slavery taught white americans that people come from different backgrounds and colors. it also built america's economic stability for a great period of time. 

women: make america what it is today. there are some societies that are in the world currently that do not give women the same right we give women here in the united states. because women have rights here in the united states, other countries' citizens strive to come to america, especially women, since they have equal rights in the united states. this is important because america is seen and desired by many in the world. 

children: children are our future. we learn from our elders and carry out things the same or differently learning from america's history. we continue tradition and change tradition if it is needed. 

b: the exchange of coined money