What does it mean when it is said that the federal courts exercise both exclusive and concurrent jurisdiction?

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.

Which of the following is the main reason early new england had villages rather than cities? 1. the area did not have ports for trade. 2. not many people lived in new england at the time. 3. new england did not have the natural resources to support cities. 4. the settlers set up new england with villages for religious reasons.

The map shows latitudes and longitudes of australia. which australian city is located north of the 15°s latitude? perth brisbane melbourne darwin