What is the means to keep carriers and amphibious ships war-ready?

How did rhe transcontinental railroad effected westward migration

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

What development led the soviet union to establish the warsaw pact? the soviets gained control over satellite countries. west germany joined nato. the allied powers grew weaker. the berlin wall was erected between east and west germ