Zachary experienced a surge of energy and feelings of self-confidence and euphoria that lasted less than an hour after taking a drug that blocked the reuptake of dopamine, norepinephrine, and serotonin. the drug he used was most likely.

Cocaine      

Explanation:

A cocaine is a strong stimulant addictive drug which is most often taken as a recreational drug. When injected or inhaled, it creates or levels up the alertness, attention or agitations. A surge of energy is experienced by the inhaler and also feels self confidence and happy. The half life of cocaine is about one hour. Cocaine obstructs the reuptake of norepinephrine, dopamine and serotonin.

Hence the answer is --

Cocaine

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    racial conflict and discrimination has existed ever since man learned to kill with rocks and bones. these conflicts arose from disputes between territory, power, wealth, religion, or simple difference. some of the most infamous racial disputes include slavery, the holocaust, and the civil rights movement.

    these listed disputes often resulted in casualties from all sides. riots, wars, imprisonment, and lynching are all commonly associated with racial conflict on severe levels.

      however, racism is an improving issue in recent decades. people are being more accepting and welcoming of diverse populations. though, the world isn't perfect and it will take much more time, if ever, until the world is rid of racism.