Wow! Picnic areas usually have built-in grills, I didn't know that!
Yes I live next to a park, it is a good idea as it can help to prevent fires.
I guess grilling is nothing new, as it has existed in the Americas since before the Europeans got here.
I guess the Native Americans tried to eat raw meat and thought "we could do better"!
Too bad the Europeans thought Native Americans were "backwards" and instead spread (even if unknowingly) their diseases and their gunfire. 
The Native Americans did put up a tough resistance, they were strong warriors and used their knowledge of the land to their advantage,
Right, but their resistance did not hold up against slavery, disease, and warfare.
It is a shame how their poulations were reduced and driven away from their lands. I don't think they ever received any sort of fair reperations.
You are right, the fact that there are over 500 federally recognized tribes within the U.S. doesn't excuse that fact. 
The US may recognize their existence but American policies against Native Americans will always be a black mark on our country's history.