Raisins in California  
Land prices in the 1870's ranged from $3 - $20 per acre in California so large "spreads" could be bought inexpensively. As word of potential profits spread, land in the San Joaquin became a very attractive investment for developers and farmers. 
                                                                                 In the late 1800's many Armenians, recognized as some of the world's most experienced  viticulturists, came to the Central Valley. Even today, many raisin growers in California are of Armenian descent. Later, in the 1950's, immigrant farmers from India found great success in the raisin industry and play a big part in the industry today.        
While the muscat grape was generally regarded as the best raisin producer, it was a seeded raisin and  the consumer didn't like seeds. Consequently, muscat raisins had to be seeded and this meant that the seeds were forced through the skin of the grapes, resulting in a sticky raisin. Raisin sales in the 1870's were limited to people willing to separate the sticky raisins by hand. What the growers needed, to expand consumer interest, was a seedless raisin grape.
In 1876, a Scottish immigrant living in the Northern Sacramento Valley, William Thompson first introduced the Lady deCoverly seedless grape - a thin-skinned, seedless, sweet and tasty grape - at the Marysville (California) District Fair. These grapes would later become known as Thompson Seedless grape. Since then, many other equally high-quality varieties have been developed, including the Fiesta, Dovine, and Selma Pete.