Because it helped natives retain their lands and is now a cornerstone of native american land protection laws now
Well the cause of a certain event in history will mean something happens.
The effect is the result of the event happening
For example. With 9/11 the cause was the twin towers collapsing. The effect would have been thousands of people dying as the result of the planes being highjacked
The answer is the North Vietnamese took over the South Vietnam spreading communism Southward and this proved the domino theory (if one country come under the influence of communism, the surrounding countries would follow).
The answer is: The spending of public funds raised by borrowing rather than by taxation.
Initially, you might want to look at how little America does produce- what could we even offer to a nation that produces almost everything. Another reason why Americans may be at a disadvantage with trading with China is due to our HUGE trade deficit- we owe so much money. On top of that, taxes on things being traded can be used against nations, if we traded with China and they raised the tax on imports than it could impact us very negatively.