1. On April 7, 1846, the United States declared war on Mexico. This event would have significant ramifications for the state of Maine, which was then part of the Republic of Maine. Many Mainers volunteered for service in the war, and some would later settle in the newly acquired Southwest territories.

2. April 7, 1875, saw the establishment of the Maine State Society for the Protection of Animals. This organization, which later became known as the Animal Welfare Society, was the first of its kind in the state and worked to promote humane treatment of animals through education, legislation, and community outreach.

3. In 1927, the Maine State Legislature passed a bill creating the wage and hour law, which established a minimum wage and maximum working hours for employees in the state. The law was intended to protect workers from exploitation and to ensure fair compensation for their labor.

4. On April 7, 1948, Maine native Percival Baxter donated over 200,000 acres of land to the state of Maine to be preserved as a wilderness area. This land, which became Baxter State Park, is now one of the largest and most pristine wilderness areas in the eastern United States, and is a popular destination for hikers, campers, and wildlife enthusiasts.

5. April 7, 1977, marked the opening of the Maine Mall, the state's largest and most popular shopping destination. Located in South Portland, the mall features over 140 stores and restaurants, as well as a cinema complex and other entertainment options. The Maine Mall has become a central hub of commerce and culture in the southern part of the state, and draws visitors from all over Maine and beyond.