Hey there! I'm happy to help!
One reason conquistadors failed to establish colonies is that the Natives kicked them out. Many of the aboriginal people were very powerful and could easily get rid of the conquistadors.
Conquistadors could also run out of resources. Nothing lasts forever, and if they couldn't obtain enough resources while exploring and settling it would be hard to establish a colony easily.
There could also be dangerous things that could hinder the settlements such as wild beasts, natural events, and diseases.
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Some people believed that immigration shouldn't happen. They believed people should stay where they're born. <span />
The president : Donald Trump
"The Constitution provides that the president "shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two-thirds of the Senators present concur" (Article II, section 2)."
https://www.senate.gov/artandhistory/history/common/briefing/Treaties.htm
Hope this helps
Answer:
16. y. Gibbons V Ogden
Explanation:
"This Supreme Court decision forbade states from enacting any legislation that would interfere with Congress's right to regulate commerce among the separate states." -From the National Archives
This decision was following the invention of the Steamboat by Robert Fulton