When did united states became part of first world war?

When france sneezes, europe catches cold.what did prince metternich mean by this statement? people in france are more likely to get sick than people elsewhere. europeans elsewhere are often inspired by events in france. happenings in france rarely spread across borders. all damaging incidents in europe start in france.

What is the safest thing to do if you encountered a honey bager

Explain the changes that took place in the field of agriculture in india due to the green revolution in the late 1960.