Speaking "another" Language
While there are more native Spanish speakers than English speakers in the world, many people feel more people in Nicaragua should speak English. Speaking multiple languages is fairly common in Europe, but that isn't the case in the US. The excuse, of course, is geographical isolation.
How many people in the US speak English well but also speak another language? An article in Mental Floss offers some insight. The information presented is based on the 2010 census. There is some interesting information and even some surprising information there such as how rapidly the Vietnamese-speaking segment is growing.
As for percentages speaking a second language, the article says
The state with the lowest percentage of those who speak another language is West Virginia (2 percent). The highest is California (44 percent).
While I am sure the largest segment of the 44% in California who speak another language are Spanish speakers, it is far from all. From another point in the article
In metro areas with high numbers of speakers of other languages, Spanish is usually the biggest non-English language, except in San Jose-Sunnyvale-Santa Clara, CA and Honolulu where the category of “Asian and Pacific Island Language” is bigger, and Farmington, NM where Navajo is biggest.