What happened before the united states could begin building a canal in panama? the united states had to invade colombia and establish a colony there. panama had to gain its independence from colombia with us support. the united states had to france finish its canal?

Correct  Panama had to gain its independence from Colombia, with US support.

Details:

As reported by the Office of the Historian of the United States:  "President Theodore Roosevelt oversaw the realization of a long-term United States goal—a trans-isthmian canal" across the Isthmus of Panama.  With Teddy Roosevelt in the White House, in 1902 the US Senate approved the building of a canal through Panama.  Roosevelt's Secretary of State then went to work to arrange a treaty with Colombia (then in control of the Panama region).  When Colombia ended up rejecting the US's offer because they thought the financial offer too low, President Roosevelt sent US naval warships to support the cause of Panama's independence from Colombia.  After Panama achieved independence (with US support) in 1903, the new country, the Republic of Panama, agreed to treaty terms with the US for the building of the canal.  The Panama Canal was completed in 1914.

answer; i believe that the correct answer is (c) arctic tundra;

imperialism and colonization in 1936

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an empire is a sovereign state functioning as an aggregate of nations or people that are ruled over by an emperor or another kind of monarch. the territory and population of an empire is commonly of greater extent than the one of a kingdom.[1]

an empire can be made solely of contiguous territories, such as the austro-hungarian empire or the russian empire, or of territories far remote from the homeland, such as a colonial empire. aside from the more formal usage, the word empire can also refer colloquially to a large-scale business enterprise (e.g. a transnational corporation), a political organisation controlled by a single individual (a political boss), or a group (political bosses).[2] the word empire is associated with such other words as imperialism, colonialism, and globalization. empire is often used to describe a displeasure to overpowering situations.[3]