The answer is thematic maps
The correct answer to fill in the blanks is "wavelength."
As far I know a u.s. citizens has the right to vote, be able to travel with a U.S. passport, be able to apply for a federal government jobs and to petition for a close relative to come live in the U.S and all of these stuff cannot do an alien resident.
One of the things that Dutch trading companies promised to settlers in New Netherland was that they would be able to cultivate land and therefore have a surplus of crops to sell as exports.
