1. On April 28, 1788, the Connecticut legislature ratified the United States Constitution, becoming the fifth state to do so. Connecticut played an important role in the creation of the Constitution, with many of its delegates attending the Constitutional Convention in Philadelphia in 1787.

2. In 1881, the first electric trolley cars began operating in Bridgeport on April 28. The Connecticut Railway and Lighting Company introduced the trolley cars, which were faster and more efficient than the horse-drawn trolleys that they replaced.

3. On April 28, 1947, the deadliest accident in the history of the New Haven Railroad occurred when two trains collided in Fairfield. The accident, which was caused by a signal failure, killed 4 people and injured 150 others.

4. In 1973, the Connecticut State Capitol building was added to the National Register of Historic Places on April 28. The building, which was completed in 1878, is a popular tourist attraction and houses the offices of the Governor and other state officials.

5. On April 28, 2012, Yale University hosted a conference on "The Future of Food" that featured speakers from around the world. The conference discussed topics such as sustainable agriculture, food security, and the impact of climate change on food production.