That mean not or
opposite (7)
that mean under or
below (2)
that mean before
(2)

may i see the passage?

b. the colonies must seek protection from other nations.

remember, the goal of an adjective clause is to add more information to a noun or a pronoun. as you can see from the examples above, you can add information by including a longer adjective clause or tighten up a sentence by turning the adjective clause into an adjective phrase.