Final answer:
Delaware and Maine are not side-by-side; Delaware is to the south near Maryland, while Maine is to the north bordering New Hampshire.
Step-by-step explanation:
The statement that Delaware and Maine are side-by-side in the northeastern United States is false. Delaware is located on the Atlantic Coast and is bordered by Maryland, Pennsylvania, and New Jersey. Maine, on the other hand, is located further north and is bordered by New Hampshire to the west, the Canadian provinces of Quebec and New Brunswick to the northwest and northeast respectively, and the Atlantic Ocean to the southeast. These two states are not next to each other but are part of the broader region known as the Northeastern United States, which includes both the New England and the Mid-Atlantic states.