Here's the thing: President Lincoln had absolutely no way to actually enforce the Emancipation Proclamation. It was a mere gesture.
Now, he had his reasons for making such a gesture.
For one, Lincoln hoped that, when the slaves heard that they had been granted their freedom, the sudden wave of freedmen, as they would come to be called, would help disrupt the war effort.
Perhaps some of these freedmen would join the Union army. That was another small reason.
As for why he didn't extend the Proclamation to the entire country...well, the thing was, he planned to.
Lincoln's greatest ambition was to free the slaves. But even in the North, there existed strong racism. Plus, some Northerners had slaves too, and Lincoln needed the North's support, not only to win the war, but also to support the Thirteenth Amendment he planned to propose after the war ended. This Thirteenth Amendment would make outlaw slavery in the United States forever.
"(3) The European view of the physical world was transformed" is the best answer in terms of a result of the efforts of Prince Henry <span>of Portugal, Christopher Columbus, and Ferdinand Magellan.</span>
Passed in 1830, authorized Andrew Jackson to negotiate land-exchange treaties with tribes living east of the Mississippi (targeted Georgia). The treaties enacted under this act's provisions paved the way for the reluctant—and often forcible—emigration of tens of thousands of American Indians to the West.<span>Nullification Crisis</span>
