LA PAZ, Bolivia — Voters in Bolivia practically threw the long-governing party out of Congress, a final count released Tuesday showed, after presidential and parliamentary elections this month heralded a tectonic shift in this Andean country.

In a devastating defeat, the Movement Toward Socialism party — which has ruled for much of the last two decades and held a supermajority in both houses of Parliament — lost its 21 Senate seats and all but two of its 75 seats in the lower house of Congress. Centrist and right-wing parties took the most votes.

“These elections really spelled the end of the MAS," said Diego von Vacano, an expert in Bolivian politics at Texas A&M University, using the Spanish acronym for the ruling party. “As a party, as a movement, it’s defunct. This is a new period in

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