The Battle of Gettysburg was a significant turning point in the war, because it‑ F. led to an immediate surrender by General Lee at Vicksburg

G. opened an invasion route to Philadelphia and New York City

H. inflicted a major setback to General Lee's plan to win the war which caused the South to never invade
the North again

J. cut off supplies for Union troops west of the Mississippi River

In a must-win clash, Union forces halted the northern invasion of Robert E. Lee's Confederate Army. ... The Union's eventual victory in the Battle of Gettysburg would give the North a major morale boost and put a definitive end to Confederate General Robert E. Lee's bold plan to invade the North

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.

yes based on alexanders actions he deserved the title of "the great". his empire covered about 3,000 miles and he was able to establish the empire over a 13 year period of time. he was able to conquer many different places. he also defeated the persians. he conquered egypt and developed a city and named it after himself.