It is common for construction contracts to include a choice-of-law provision or language. This is language that says the contract is to governed under the laws of the state of Florida (by way of example). Pick any jurisdiction. There may be other language in the provision, but the gist is that if there is a dispute arising under the agreement, the laws of the state designated in the choice-of-law provision will apply.

For example, you can have an agreement in Florida with a vendor but that agreement includes a choice-of-law provision that says the state of Virginia applies. This is because the vendor may be based in Virginia and the agreement was based on Virginia law.