I guess "Google" is wrong. That is what THEY published. But, what do they know?
If you can find a site anywhere that puts the start of the British Empire later than the sixteenth century or its end prior to the twentieth century, by all means, put up a link.
But forget about Google for a moment, we can reason this out; if our war for independence was fought starting in 1776 and the British Empire didn't collapse until the Second World War, we know it lasted at least almost two hundred years.