How did irving berlin contribute to the culture of the 1920s? ?

Read the following excerpt from franklin d. roosevelt’s “day of infamy” speech. which line reveals the purpose of the speech?

What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? they created the scientific method to outline how science should be conducted. they were able to find the orbit of a comet and predict the year of its return. they discovered the three newest planets--uranus, neptune, and pluto. they explained why objects appear to have color.

What post war changes took place in north america