Why did european nations increasingly form allies in the 1900s

What are the most populous and least areas of russia and why are some areas more heavily populated than others

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?

From where do ocean waves obtain their energy