Greatest American Victories in past 100 years

[OSR stands with Israel]

1. Battle of Normandy
2. Battle of Midway
3. Battle of Inchon
4. 1991 100 hours offensive
5. Battle of Okinawa

[Beet]

The initial invasion of Iraq March 21-April 9, 2003 was pretty big.

[Frodo]

You're forgetting the battle of Leyte Gulf, which forever destroyed the Imperial Japanese Navy as a fighting force thereafter. 

[HankW501]

Sunday the 20th of July 1969:

"... one small step for a man, one giant leap for mankind."
- Neil Armstrong from the moon

[Blair]

[YaBoyNY]

When we single handedly saved the world during WW2, since it was our duty as the real life Captain America.

[jaichind]

Relative to correlation of forces involved I thought the Battle of New Orleans was the most impressive.  In terms of size, impact and relative difficulties involved Battle of the Philippine Sea was also quite decisive. 

[Mike67]

1)Battle of Yorktown
2)Battle of the Bulge
3)Battle of Saint Mihiel
4)Landing at Normandy
5)Landing at Inchon