Why is Marijuana illegal?

I know the story about the cotton and textile industries buying off politicians to get hemp off the market. I believe it is true.

But…

What’s the actual reason that the Government tells us it is illegal?

I don’t smoke Pot. I did in my younger days, but it’s not in my life currently. And my concern isn’t even for all the great uses of Hemp products we could benefit from.

I’ll be honest. It really pisses me off that a government thinks they can tell me what kind of seed that I can or cannot plant into my own land. What gives them the right to do that? Why can’t I grow that plant if I want to?