Free land (well they had to pay like 10 cents), and gold (the gold rush).
In the early years of the 19th century, the time of the economic growth opened different opportunities to women. The right to suffrage was opened. Education was offered. Women accepted challenges on taking degrees of their choice.
Their education helped them become additional workforce in the state industries.
The 5th ammendment protects you from being tried twice for the same crime.