During the 1830s and 1840s, a new system was instituted in which delegates chosen directly by party members in towns and cities were assigned the task of selecting party candidates. They debated and adopted a platform and built party spirit by celebrating noisily. This system is called a

Party Convention also known as Political Convention.

Explanation:

The formal purpose of this convention is to select the party's nominee for President, as well as to adopt a statement of party principles and goals known as the platform and adopt the rules for the party 's activities, including the presidential nominating process for the next election cycle. Before the development of conventions in the United States in the 1830s, American political parties selected candidates and policies in informal caucuses of the parties’ congressional delegations.

a countries leader should be motivated by the common good of the country.

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