Hey there!
At the Wannsee conference in 1942 the Nazis made plans to find a final solution to the "Jew problem". In their opinion, there were too many jews in their empire and they were looking for a way of getting rid of them (It sounds - and is - cruel, but unfortunately that's the truth). They found their 'solution' in the form of concentration and death camps.
The rules discussed were a follow-up of the Neurenberger laws (1935) which had as a purpose to isolate the Jews.
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James Madison played a great role in establishment of the US as a republic. During the writing of the constitution, the founding fathers were adamant that they wanted democratic system of governance. However, they were torn between a direct democracy and a republican democracy. James Madison dismissed a direct democracy since the US is a large country and thus impossible to be governed through direct pure democracy. Instead, the father of the constitution argued for a scheme of representation in a republican setting. He especially lauded such a government since it even catered for the rights of the minority than in direct democracies.
The 26th amendment addressed concerns about age discrimination by saying that citizens who are eighteen years of age or greater shall not be refused or compressed by the government authorities whether federal or state on the statement of age. It restricts states from segregating among voters based on age, for people who are at least 18 years old.