The document that institutionalizes

American ideas is the

The document that institutionalizes American ideas is "the Declaration of Independence".

Explanation:

The Declaration of Independence (DoI) and the Constitution are documentation that provide the idealistic pillars for the United States' democratically elected government. The independence or DoI, provides a framework for the principles of popular sovereignty, the notion that government is needed to serve the public who elect a leader to convey their desire. Whereas the Constitution of U. S illustrates its government program's blueprint, which seeks to equalize freedom of the individual with law and order.