What is a criticism of studies that use how long infants look at different types of events as a measure of their understanding of how the world works

The principle of checks and balances is based on the notion that

The platt amendment of 1901 forbade cuba from entering into any treaties that would allow undue foreign involvement in cuban affairs. this law was passed after the spanish-american war to make sure that european nations weren’t going to get involved with cuba. 1, why might the platt amendment be considered ironic? 2, what reasons would the united states have for not wanting european influence in cuba?

How did southerners view andrew johnson and republicans in congress