The Republican Party.
major parties
Rebublicans
During and after the US Civil War, the Republican Party became the dominant party of the United States. It was, however, a divided party. Lincoln had to balance the Radical Republicans, with more moderate Republicans and the War Democrats.
joining a political party
the communist Party
The Democratic Party, with exception of two brief periods.
The dominant political party in Canada during the last century was the Liberal Party.
Democrat
major parties
Rebublicans
apathy
During and after the US Civil War, the Republican Party became the dominant party of the United States. It was, however, a divided party. Lincoln had to balance the Radical Republicans, with more moderate Republicans and the War Democrats.
joining a political party
The name of the dominant political party in Mexico that started in 1929 and lasted for 71 years is called PNR. Then in 1938 it became PRM and in 1946 it was the PRI which was its lasting name.
Such a political organization is often referred to as a "dominant party" or a "one-party dominant system." In this system, the same political party consistently secures electoral victories and exerts significant control over the government and political processes. Some examples include the Communist Party in China or the African National Congress in South Africa.
The dominant political parties in the USA are the Democrats and the Republicans. Though someone from the Green Party was a few electoral votes away from winning the 2000 election, the Green Party rarely comes this close and is not considered a dominant political party in this country. Some other political parties are communism and socialism, but they don't have very much power in this country.
Mississippi is a "red state"-- this means the dominant political party is the Republicans. There is a Democratic party in the state, but it is not nearly as powerful as the Republicans currently are.