So, here's how the U.S. built its first-ever tank, how it served in the Army, and where we can still see its design in tanks on today's frontlines. [Featured image by John Schaunlaub via Wikimedia ...

The completed vehicle was running by the end of 1915 but by then a new design was under construction and this would become the prototype for all British heavy tanks in the First World War.

However, the Heavy Tank M6—America's first heavy tank—wasn't a successful design, remaining stateside throughout the war and declared obsolete even before Germany surrendered. They also ...

The tank was a response to the annihilating firepower ... Instead, it chose to create a variation of the first design by adding just an electrically propelled gun mount to the gas-electric tractor.