Yes...I you have any doubt, watch "Breaking Amish" on TLC.
There are Amish or other plain sect congregations on every continent except Antarctica.
yes.
Amish are called Amish because the founder of it was Jacob Ammann
There are Amish in Puerto Rico. However, I don't know of any hispanic Amish.
Yes, there are there of many Amish people.
No more and no less than any other general group of people.
hiring minorities and the handicapped
No. There are no Amish communities in NJ.
Not all Amish people have to be white. This is because some other people can be adopted or converted into the Amish way of life.
It would depend on how seriously they are handicapped. If they live and work in the community, as many do, in any way then of course they pay taxes.
As a married couple if you meet and Amish person and want to become Amish you can. There is nothing in the Amish lifestyles that prevents people to converting to the Amish lifestyle.