Nothing; the three brothers drew fated lots after the Titan War to divide Kronos's kingdom between them.
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No, he wasn't tricked into it. Each brother in a way 'drew straws', it was purely by chance, not by trickery.
Depending on your source, Hades was tricked by his brothers, Posiden and Zeus. He was left with ruling the underworld and just made the best of it.
In Greek mythology, Hades, the god of the underworld, did not necessarily despise his brother Zeus. However, Hades did have some resentment towards Zeus because Zeus was given the ruling of the heavens and Earth, while Hades was assigned the underworld. It can be said that Hades felt overshadowed and somewhat resentful of his brother's greater power and domain.
Zeus did not "send Hades to the Underworld"; just as Zeus rules the heavens, Hades rules the Underworld. According to one of the myths, Zeus selected the Heavens as his realm, and allowed Poseidon to select next because he was eldest. That left Hades (or more accurately Plouton) the Underworld as his realm, which he found suited him just fine.
Hades is king of the underworld because he was caught trying to steal his brother Poseidons trident and his other brother Zeus lightning bolt. As a punishment Zeus banned Hades to the underworld forever.