The Anti-Imperialist League argued that imperialism and expansionism went against the spirit of the United States' founding documents, such as the
Constitution. Which event from the late 19th century or early 20th century
most clearly supports this argument?

The American annexation of the Philippines.

Explanation:

The Anti Imperialist League was created in 1898, in response to the annexation of the Philippines by the United States. It was, basically, a group of conservative democrats who opposed the expansionist idea once defended by Manifest Destiny, as well as the militarization and strategic expansion ordered by the main leaders of the Republican Party. Its foundation lay in the principle of freedom and consensus of the governed, by means of which they said that America would act as a tyranny to try to expand its territories, by crushing the rights of the inhabitants of those lands.

separation of powers, therefore, refers to the division of government responsibilities into distinct branches to limit any one branch from exercising the core functions of another.   the intent is to prevent the concentration of power and provide for checks and balances.  

the traditional characterizations of the powers of the branches of american government are:

* the legislative branch is responsible for enacting the laws of the state and appropriating the money necessary to operate the government.

* the executive branch is responsible for implementing and administering the public policy enacted and funded by the legislative branch.

* the judicial branch is responsible for interpreting the constitution and laws and applying their interpretations to controversies brought before it.

forty state constitutions specify that government be divided into three branches:   legislative, executive and judicial.   california illustrates this approach; "the powers of state government are legislative, executive, and judicial.   persons charged with the exercise of one power may not exercise either of the others except as permitted by this constitution."

while separation of powers is key to the workings of american government, no democratic system exists with an absolute separation of powers or an absolute lack of separation of powers. governmental powers and responsibilities intentionally overlap; they are too complex and interrelated to be neatly compartmentalized. as a result, there is an inherent measure of competition and conflict

minnesota:   minnesota house research,   separation of powers: when statutes and court rules conflict, 2005

agriculture revolution