Invasion of the Strange

If we were to be invaded by an unknown species, how would we prepare our planet, for an invasion of the strange? Would we cower in underground bunkers, behind battlements, or would we go on offensive, and seek to drive them away. This all depends on what the aliens think of us, if they are friendly or hostile.If, say they were friendly, and wished to share there knowledge and lifestyle, if they wished us to live in harmony and peace, in the end, might one species overrule the other? Would the 'lower' species be forced into an age of slavery and tyranny, having to serve with every breath the other? If we were the species forced to serve, would we rebel, and fight for freedom and equality? Would we be able to set aside our differences and join together, and up-rise as one? Or would our rebellion crumble, as we fight within ourselves. If disaster came for all, would we sacrifice ourselves to save the very ones, who, for so many years, have tortured us, shunned us, and made us serve?