Hi,
In the following articles you can see a good summary of the history of FPGAs (as seen from the FPGA group on Reddit):
- How the FPGA came to be, Part 1
- How the FPGA came to be, Part 2
- How the FPGA came to be, Part 3
- How the FPGA came to be, Part 4
- How the FPGA came to be, Part 5