if you were an alien race wanting to take Earth how would you do it? Would you go in guns blazing and conquer or would you be more subtle about it and do so in a more stealthy manner? For me the quiet way biding my time. I'd infiltrate human culture with my culture a tiny bit at a time and change people's ideas about things via social engineering, and social media, movies TV etc. After enough time has passed and people are OK with certain ideas in their world then I'd step in and seize power because by then a lot of the people would have been indoctrinated to accepting my culture because those ideas had been fed to them over time.