The M-A-I-N<span> acronym is often used to analyse the </span>war<span> – militarism, alliances, imperialism and nationalism.</span>
Western European countries integrated their economies after 1945 by the French proposing that the nations that produced most of Western Europe's steel and coal unite their facilities. In 1952, France, West Germany, Italy, and the Low Countries formed the European Coal and Steel Community. A central authority regulated production and prices, and members not charge each other tariffs on coal and steel.
To fill in the blank it would be "farmers" as the Tang let their soldiers farm when they were not fighting, so that they can produce food for themselves.
The Second World War was started by Germany in an unprovoked attack on Poland. Britain and France declared war on Germany after Hitler had refused to abort his invasion of Poland.