Yes looks like it. Ambrosia trifida - Giant ragweed.

I wonder why it's Latin name is Ambrosia?

Good question, and from what I've been able to google, may derive from Pliny, who used the word (which was originally the elixir of the gods) to refer to various herbs.

Ask and herbalist, they can tell you why. Most herbal tinctures are rather bad tasting. If you get used to tasting herbal teas and tinctures enough you can do it with a straight face. Yeah, some are that bad and so newbies tasting them are quite surprised. Another herbalist and I were shocked by the tincture of Ambrosia artemisiifolia we had made. It was good tasting. There is your reason. :)

Thanks everyone!