What time period was big foot even found?

Bigfoot has never found cause it not real America is is just over 600 years old no American has ever killed shot or found a bigfoot the died from natural causes not even the native American have ever killed or found one in 1000 year no one has ever killed or found or even seen up close. The show finding bigfoot claims that bigfoot lives in 10 or more states but America has over 2 billion people no has ever seen it up close or found a body or bones and when man or an animal die it leave behind its dead body and the bones they just don't disappear in to air