Invaders From Mars (if we ever make it that far)

Just imagine this scenario:

We send man to Mars.  We send more men to Mars.  We begin to colonize Mars.  We purposely raise the temperature of Mars to increase atmospheric pressure and free up frozen water.  We begin to terraform the planet.  The planet is now taking on a familiar Earth like appearance after several hundred years.  Humans are genetically altering themselves to live in a 1/3 gravity lower pressure environment.  Humans aren’t so human anymore and can now survive with no pressure suit and only a breathing mask.  People born on Mars are now Martians.  Fewer Earthlings make the trip.  Mars grows in population.  Earth continues to snub Mars.  Relations are strained and tensions are high.  Mars is running out of Earth-only life sustaining resources.  Martians invade Earth!

It’s like rewinding back from the future!  Ok it’s far fetched but it’s theoretically possible that one day Martians (our descendents) will invade Earth for some reason.