The Battles of Lexington and Concord signaled the start of the American Revolutionary war on April 19, 1775. The British Army set out from Boston to capture rebel leaders Samuel Adams and John Hancock in Lexington as well as to destroy the Americans store of weapons and ammunition in Concord.
Those are primary colors because if you think about it, you have to mix blue and red to make purple, you have to mix yellow and blue to make green, but lastly, you have to mix red and yellow to make orange. So the reason that they are primary colors is because they make up the secondary colors and in order to make any other color such as pink, teal, fuscia, or even maroon you need to first start off with the primary colors.