What are good statistics projects that i could do tracking 150 years worth of data

Read : "The Birth of Plenty" by Peter Berstein and then see if you can independently verify his theories of the growth of human prosperity over that time frame.

Delete data, experience yourself at ground level then infer the results

War death tolls: military vs. civilian: worldwide scale

Votes on impeachment could be timely.

Home ownership and cost of homes vs average annual income and availability of loans. You could narrow this to focus on a particular group such as in the state of California or among African Americans.