For the most of its existence Euroasian civilizations didn't function based on the existence of inhabited lands which are to be conquered, quite the opposite, i

For the most of its existence Euroasian civilizations didn't function based on the existence of inhabited lands which are to be conquered, quite the opposite, it was known the other humans are there and the conquering involved military actions. And there were other civilizations on the American continent too at the time it was "discovered" by the Europeans. Still, the whole Earth is Earth-life-friendly due to so many aspects not present on Mars, including the magnetosphere and air.