The Gold Rush did, indeed, speed up the process of Manifest Destiny. The Gold Rush was a period of hope for riches. Once a person would hear that there had been gold discovered in the West, they would instantly pack up their things and head Westward. Manifest Destiny was the American's belief that they needed to expand. Traveling West and settling all around similar areas would be the beginning of expansion. People would keep moving from their land and heading toward the source of gold. When the gold rush technically ended, people had the choice to either settle where they have been for a long time, now, or head back to where they had come. Maybe they settled in the middle of where they are and where they were because it was such a tiring journey that they weren't willing to make. However, knowing that they had gone to the West and expanded a little, it would strike their interest and fascination even more to the point where they may want to expand even more than they had wanted to before. Already having traveled to the West, they wouldn't have any time to doubt that they could expand easily.
That would be the Jews. He used them as a "stepping stone" to get what he initially wanted.
