Explanation:
It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors. Over the next several years, consumer spending and investment dropped, causing steep declines in industrial output and employment as failing companies laid off workers.
From the point of vies of this place (i.e. for the people who stayed in the place) this is called emigration: when people leave the country, it's called a mass emigration.
From the point of view of the place where this person settles down, this is called immigration and this person is an immigrant
The room was probably filed with fear and sadness, most of the people outside might of wondered about who shot him? or what happened? or making their own assumptions to this tragic event.
where is the map you are referring to?