Prior to western colonization of course the native people had conflicts, just not at the scale the colonizers could achieve. During the genocide of the natives some tribes used it as an excuse to kill their enemies, sometimes to curry favor with a technologically superior force, and sometimes just to kill their enemies. Some fought back against the invaders, with varying degrees of success. Most people just died.
None of that makes it less of a war against the native americans.
> None of that makes it less of a war against the native americans
No that's exactly what it makes it, as their conflicts subtract from those with newer arrivals. Different groups fighting each other, and then other different groups from Europe came, and made allegiances with specific local groups, then collaborated in their conflicts.
It's worth understanding that 'western colonization' wasn't a singular coherent force. There were different foreign groups with different interests - who were fighting with each other in North America.
Similarly there were 'Native Americans' (quotes as this is a colonial term) pursuing their own interests, even going to Europe. I'm not sure it's your perspective but there is a popular historic image of native americans being a defenceless people who foreigners came and wiped out which simply isn't correct, and ironically quite colonial.