Mars was almost identical to Earth roughly four billion years ago. Today, it remains the
only planet in our solar system that's enough like Earth to even possibly sustain human life. It's
half the size of our pale blue dot, but has the same amount of land, which means we'd have a
place to settle and flourish. The temperature on Mars is frigid, but its ice means we'd have a
water source. The planet's oxidized soil means we could grow food, and the existence of methane
gas means we could create fuel.
Some historians argue that slaves “freed themselves” by fleeing to Union armies, thereby forcing lincoln to issue the emancipation Proclamation. How persua- sive is that argument?