Communication between countries, people, have had eventually an effect on our lives. As mentioned earlier, there is no 'proper' way to use language. There is a standard way, as slang is a change on the standard, like options on a new car. The standards have changed over time, and are different from culture to culture as a culture's evolution may have played an important part in the culture's future. The proper ways have been stretched, strung out, and hung to dry, in several examples.
Slang is a first, while languages developed from different languages also is an example.
Latin is the base of many, many languages, and it is also known if you study a language which is very same as one you know, you will learn faster. The standard is changed everyday, as we coin and use new words. Influential people also play a part in our evolution of language. This is an example in speeches of important people, books of all kinds, etc. Books also may influence our writing in a myriad of ways.