In May 1917 President Woodrow Wilson and Secretary of War Newton Baker chose Pershing to command the American Expeditionary Force going to Europe in support of the Allies. Arriving in France during June, Pershing immediately began planning the organization and employment of a large American army.
It began when the representatives of the Third Estate chose a new king, created the National Assembly and pledged to create a Constitution.
It officially began with the storming of the Bastille on July 14th, 1789
Conquering of lands and severe control i think