Revised thesis: The many scandals of Hoover's administration revealed basic problems with the Republican Party's nominating process. Abortions should be legal.
A significant decrease in the production of tobacco products will lead to the minimization of demand on it as the price will get higher, the supply will decrease and people will not be able to buy it. Everyone knows that politics, economics, and culture are important.
Tip: In order to write a successful thesis statement: Avoid burying a great thesis statement in the middle of a paragraph or late in the paper.
Avoid merely reporting a fact. A thesis is never a list. Write that as your thesis statement.