Of course. Race is not an issue to Freemasonry. Check out the related links.
I am a Caucasian, and I have faced prejudice from non-Caucasians a few times, so I can safely assume that other Caucasians have faced some sort of prejudice as well. In my case, I think it was "revenge" for the prejudice of Caucasians in the past.
There are no rules against gay people becoming masons, but acceptance will vary, depending on the region of the country.
Only 32nd degree Masons are allowed that privilege
Masons can be Democrats or Republicans or Independents, but typically points of contention between political beliefs are not allowed to disrupt Masonic life.
Malignant melanoma also affects non-Caucasians--though sun exposure probably does not play a role--at a rate of 10% that of Caucasians.
She refused to sit in the back of the bus (where whites {Caucasians} were allowed to sit).
Freemasons were indeed involved in the architecture, cornerstone-laying and building of Washington, D.C. . There were also many non-Masons who were also part of building this Capitol of The United States.
There is no patron saint of caucasians.
This is a popular opinion held by Masons and non-Masons alike. For an interesting treatment on the topic, I'd suggest reading John J. Robinson's book "Born In Blood". This book was written by Brother Robinson before he became a Freemason based on his own extensive research.
caucasians are just white people.
Georgia has the bulk of the population being Caucasians. The largest number of non-native whites are Englishmen and Irishmen.
There is no common "Masonic hand gesture". You may be referring to Masonic grips, which vary depending on the degree one has attained. These are considered secret, and are therefore not revealed by obligated Masons to non-Masons.