A political party is an organized group of people who have the same ideology, or who otherwise have the same political positions, and who field candidates for elections, in an attempt to get them elected and thereby implement the party's agenda. While there is some international commonality in the way political parties are recognized and in how they operate, there are often many differences, and some are significant. Most of political parties have an ideological core, but some do not, and many represent ideologies very different from their ideology at the time the party was founded. Many countries, such as Germany and India, have several significant political parties, and some nations have one-party systems, such as China and Cuba. The United States is in practice a two-party system but with many smaller parties also participating and a high degree of autonomy for individual candidates.