What does the slogan "War is Peace" mean?

This paradox essentially means that if a population believes they are at war, there is peace in the country. Nobody will question a government at war for the people. Historically there is nothing like a war to boost a party's popularity. These wars are a fabrication. One month they are fighting Eastasia, the next Eurasia. These endless wars help keep the state in perpetual martial law and hence give the state perpetual control.