Which election year saw the first "true" or modern election in US History?

The 1824 election was the first election in American history in the popular vote mattered, as 18 states had chosen  presidential electors by popular vote (six states still left the choice up to their state legislatures).

Explanation:

John Quincy Adams defeated Andrew Jackson in 1824

The 1824 presidential election was the first election in American history in which the popular vote mattered, as 18 states chose presidential electors by popular vote (six states still left the choice up to their state legislatures).

Explanation:

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°

they thoght they were going to nuke each other