1. On April 16, 1863, the Michigan 10th Cavalry was organized at Detroit. It was a regiment composed of African American soldiers who served in the Union Army during the American Civil War. The 10th Cavalry saw action in several battles, including the Battle of Saltville, and played an important role in securing freedom and rights for African Americans.

2. On April 16, 1930, the first dark sky preserve in the world, the Headlands International Dark Sky Park, was established in Emmet County, Michigan. It is a protected area where artificial lighting is minimized so that people can enjoy the natural beauty of the night sky. The park is a popular destination for stargazers, astronomers, and nature enthusiasts.

3. On April 16, 1934, the Detroit Tigers played their first game at Briggs Stadium, which was located on the corner of Michigan and Trumbull avenues in Detroit. The stadium, later renamed Tiger Stadium, was home to the Tigers from 1934 to 1999, and saw many great moments in baseball history. Today, the site is a public park, and the flagpole from the old stadium still stands.

4. On April 16, 1947, the Michigan State Police conducted a raid on the Capone family's compound in Berrien County, Michigan. They were searching for evidence in connection with the unsolved murders of several members of the notorious gangster's family. The raid yielded a small amount of evidence, but the case was never solved.

5. On April 16, 2008, the Enbridge Line 5 oil pipeline was completed and began carrying crude oil and natural gas liquids from Superior, Wisconsin, to Sarnia, Ontario, through Michigan's Upper and Lower Peninsulas. The pipeline has been a controversial issue in Michigan due to concerns about the risk of oil spills in the Great Lakes and the impact on the environment and Native American communities.