One Party Country refers to the Republican Party's

Republican Party (United States)

The Republican Party is one of the two major contemporary political parties in the United States, along with the Democratic Party. Founded by anti-slavery expansion activists in 1854, it is often called the GOP . The party's platform generally reflects American conservatism in the U.S...

 vision for long term electoral supremacy in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 through a generation-long effort to develop its political infrastructure, its knowledge of voter motivations, and by appealing to voter demographics that have traditionally leaned to the Democrats

Democratic Party (United States)

The Democratic Party is one of two major contemporary political parties in the United States, along with the Republican Party. The party's socially liberal and progressive platform is largely considered center-left in the U.S. political spectrum. The party has the lengthiest record of continuous...

 (e.g. Latinos and African-Americans). It is also the name of the book, One Party Country: The Republican Plan for Dominance in the 21st Century, by Los Angeles Times reporters Peter Wallsten

Peter Wallsten

Peter Wallsten is a reporter for the Wall Street Journal who covers national politics. Wallsten joined the Journal in October 2009 from the Los Angeles Times, where he authored, with Tom Hamburger, One Party Country: The Republican Plan for Dominance in the 21st Century.A graduate of the...

 and Tom Hamburger.