non-verbal communication cognitive development. The research takes into consideration factors like the similarity of the language, the cultural background and education experience. These students mostly come from public schools from various areas, having similar social and economic background. Results show that in the child's early stage, multilingual kids are very different from one another in their language and cognitive skills development, and also when compared to monolingual children. When compared to monolinguals, multilingual children are slower in building up their vocabulary in every language. However, their metalinguistic development allowed them to understand better the structure of the language. They also performed better in non-verbal control tests. A non-verbal control test refers to the ability to focus and then able to divert their attention when being instructed to. Reasons for persistence Convergence principle According to the convergence principle, language style tends to change to that of people who are liked and admired. Conversations in which one party speaks a language different from the other persons both are hard to maintain and have reduced intimacy. Thus, speech is usually adapted and accommodated for convenience, lack of misunderstanding and conflict and the maintenance of intimacy. In intermarriages, one partner tends to become monolingual, which also usually applies to the children. Predominance of English The predominance of English in many sectors, such as world trade, technology and science, has contributed to English-speaking societies being persistently monolingual, as there is no relevant need to learn a second language if all dealings can be done in their native language; that is especially the case for English-speakers in the United States, particularly the Northeastern United States, the Midwestern United States and most of the Southern United States, where everyday contact with other languages, such as Spanish and French is usually limited. The country's large area and the most populous regions' distance from large non-English-speaking areas, such as Mexico and Quebec, increase the geographic and economic barriers to foreign travel. Nevertheless, the requirement for all school children to learn a foreign language in some English speaking countries and areas works against this to some extent. Although the country is economically interdependent with trade partners such as China, American corporations and heavily-Americanized subsidiaries of foreign corporations both mediate and control most citizens' contact with most other nations' products. There is a popular joke: "What do you call a person who speaks three languages? A trilingual. What do you call