Read this passage from roosevelt's "quarantine" speech:
war is a contagion, whether it be declared or undeclared.

which piece of evidence support the viewpoint expressed in this passage?

the hopes for peace thus raised have of late given way to a haunting fear of calamity.

civilians, including vast numbers of women and children, are being ruthlessly murdered with bombs from the air.

they want to exert themselves in industry, in agriculture and in business, that they may increase their wealth.

we are adopting such measures as will minimize our risk of involvement, but we cannot have complete protection . .