What does this phrase mean "one if by land, two if by sea."

When and why did the united states enter world war 2

You will now write an essay of at least three paragraphs that takes a position on an opinion in hazelwood v. kuhlmeier. you may choose to support the majority opinion or justice brennan's dissenting opinion. you should support your argument with reasons provided in the opinions, although you may also give reasons of your own. your essay should also decision in the case

How did the industrial revolution give an advantage to industrialized european nations over non-industriallized nations?