100 POINTS DUM B ANSWER WILL BE REPORTED TO BRAIN LY Rebuttal this counter-argument: People should attain the legal rights of adulthood at the age of 21 or up because they have become mature, physically, and mentally strong.
My argument is People should attain the legal rights of adulthood at the age of 18 because that’s when our minds can start developing, especially with more responsibilities and new experiences.

Photosynthesis, the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

Explanation:

Your argument is People should attain the legal rights of adulthood at the age of 18 because that’s when our minds can start developing, especially with more responsibilities and new experiences.

Rebuttal to your argument and support the original argument of People should attain the legal rights of adulthood at the age of 21 or up because they have become mature, physically, and mentally strong:

At the age of 18, the mind just starts developing. With more responsibilities and new experiences, it can be overwhelming and be influenced by others.  If the mind is allowed to further develop and become more mature at age of 21, it will be able to better handle the responsibilities and rights of adulthood.

the speech this question is referring to is president kennedy's special message to the congress on urgent national needs, may 25, 1961

kennedy responds in a very direct and concrete way to those thinking that communism is a positive system:

"yet their aggression is more often concealed than open. they have fired no missiles; and their troops are seldom seen. they send arms, agitators, aid, technicians and propaganda to every troubled area. but where fighting is required, it is usually done by others--by guerrillas striking at night, by assassins striking alone--assassins who have taken the lives of four thousand civil officers in the last twelve months in vietnam alone--by subversives and saboteurs and insurrectionists, who in some cases control whole areas inside of independent nations." (kennedy)

president kennedy presents communism as cowardly, as a hidden and treacherous weapon that strikes from the shadows like thieves, he represents the system as not even being capable of showing and open and overt attack or confrontation. to finish up the response, he expresses that the system attacks even a country's idependence and freedom.