a presidential candidate needs at least % of voter support in several major polls to qualify for the debate

15%

Explanation:

Under the 2020 Criteria, to receive an invitation to debate, a candidate must: (i) be Constitutionally eligible to hold the office of President of the United States;  (ii) appear on a sufficient number of state ballots to have a mathematical chance of winning a majority vote in the Electoral College; (iii) have a level of support of at least 15 percent of the national electorate, as determined by five national public opinion polling organizations, using the average of those organizations’ most recently publicly-reported results at the time of the determination. The polls to be relied upon will be selected based on the quality of the methodology employed, the reputation of the polling organizations and the frequency of the polling conducted. The CPD will identify the selected polling organizations well in advance of the time the criteria are applied.

2020 Nonpartisan Candidate Selection Criteria.

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for the 2 countries u can do china and america because america has a democratic government while china has a communist government.

a democracy is a government run by the people either by directly voting or indirectly by electing representatives. an oligarchy is a government run by a few or a small group of people. a democracy and oligarchy are similar because both in an oligarchy and an indirect democracy, a small group of induvial determine the laws for a large group of people they are different because in an oligarchy it is easier to control and they do not have to answer to a large number of people in the country, unlike a democracy where they do have to answer to a large number of people an county that is a democracy would be the united states. a country that is an oligarchy would be the china.