Made in 1945.
It was made by Colt in 1944.
about 1941
It was made by Remington Rand in 1943
made about 1943 by Remington Rand
7790314 is not a serial number, it is the part number for the slide.
You will have to call Colt and request a letter.
Made about 1904.
Made in 1905.
You can find a list of Colt M1911 and M1911A1 production serial numbers at http://www.coolgunsite.com/pistols/colt%20production.htm. Going by the numbers in your question (7071), it looks like you have a M1911 that was made for the Navy in 1912, the first year of production.
If you mean the 1911 government model, it was made in 1912
made about 1918
1923