The platform of the Republican Party of the United States is generally based on American conservatism, contrasting with the modern liberalism of the Democratic Party. The positions of the Republican Party have evolved over time. Currently, the party's fiscal conservatism includes support for lower taxes, free market capitalism, deregulation of corporations, and restrictions on labor unions. The party's social conservatism includes support for gun rights outlined in the Second Amendment, and other traditional values, often with a Christian foundation, including restrictions on abortion. In foreign policy, Republicans usually favor increased military spending and unilateral action. Other Republican positions include restrictions on immigration, more specifically opposition to illegal immigra