This type of exchange is called a negotiation. When countries or governments negotiate with each other, the agreement they make is called a treaty. Long ago, when Europeans began settling in North America, they made many treaties with native tribes. One such tribe, the Haudenosaunee, recorded their treaties by weaving beautiful Wampum belts that symbolized the agreements. Wampum are beads made from mollusk shells, which are highly valued in the Haudenosaunee culture.