Not necessarily. Confirmation bias involves some emotionally charged interpretation of data rather than inductive reasoning. But nothing OP said seems emotionally charged.

https://github.com/dessalines/essays/blob/master/us_atrocities.md

Yeah sure, compiling a list of US atrocities requires one to assume there are enough to compile the list and seek out details on each item. But if you take a look, the far more salient fact IMO is that it is a giant list spanning the history of the US from even before the US was officially a nation. An alien might just induce that the US is actually quite a violent institution, either in isolation, or compared to similar lists for other nations on earth