Marquis de Lafayette helped to train the American colonists and even served in battle with them. Lafayette first came to the American colonies in 1777. Upon arrival, was appointed a Major General in the colonial army. From there, he taught the American colonists military techniques, strategies, and other important information needed to defeat the British. He even fought for the American colonists in the Battle of Brandywine. His help was imperative to the colonists success against the British.
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Well based on the fact that the very first patented rock crushing machine was made in the year 1830, and the first successful, Eli Whitney Blake's, was in 1858, I'd say the development process was around 30 years.
Germany attacks USA trading ships
The Minnesota State Seal is just another name for our flag. (I live in Minnesota) <span />
For some of us, it began late at night: huddled under bedroom covers with our ears glued to a radio pulling in black voices charged with intense emotion and propelled by a wildly kinetic rhythm through the after-midnight static. Growing up in the white-bread America of the Fifties, we had never heard anything like it, but we reacted, or remember reacting, instantaneously and were converted. We were believers before we knew what it was that had so spectacularly ripped the dull, familiar fabric of our lives. We asked our friends, maybe an older brother or sister. We found out that they called it rock & roll. It was so much more vital and alive than any music we had ever heard before that it needed a new category: Rock & roll was much more than new music for us. It was an obsession, and a way of life.