There have been some critical issues at different times in American history, such as nullification, slavery, secession, reconstruction, green-backs, free silver, the regulation of trusts, imperialism, the league of nations, and so on. Most of the leading issues in recent years have been economic in character; they have been concerned with such matters as the railroads, the merchant marine, the regulation of industry, immigration, relations with Mexico, banking reorganization, the extension of aid to agriculture, conservation, budget methods, and international trade. Footnote 53: This is quite a contrast with what has happened in France, Germany, Italy, and the other countries of Continental Europe. In these countries there are several parties and they continue in existence for long periods of time. No two parties ever manage to get the field of politics largely to themselves. It is significant that the two-party system has flourished in the English-speaking countries, that is, in Great Britain, the British colonies, and the United States. Everywhere else there are from three or four to a dozen parties. Why should there be this difference? Footnote 54: Until recent years the state convention also had the function of nominating the party candidates for state officers, but in most of the states this prerogative has been taken away from the convention and the nominations are made by the party voters at state-wide direct primaries. In the others the nominations are still made by the conventions. Even where the primary is used, however, it is sometimes the practice of a convention to adopt an “unofficial” slate of candidates which it recommends to the voters for their endorsement at the primary (see p. 129). Footnote 55: At the Republican national convention of 1880 it took thirty-six ballots to nominate Mr. Garfield. In 1912, at the Democratic national convention, Woodrow Wilson was not nominated until the forty-sixth ballot. Sometimes the very first ballot results in nominating the candidate as happened with Mr. Wilson in 1916. How many ballots were taken before the nomination of Mr. Harding at Chicago in June, 1920, and before the nomination of his opponent, Mr. Cox, at San Francisco, a few weeks later? Footnote 56: