Spain, Portugal, Great Britain, France and Netherlands are the five nationalities were most involved in colonizing southeast in the 1500s
Step-by-step explanation:
A lot of time, south east Asia was colonized by several countries and the time period of colonization was from the 1500 to mid 1940. This area was majorly colonized by Spain, Portugal, Great Britain, France and the Netherlands.
Apart from this the United States and Japan were also involved in making south east Asia their colonies. These colonies imposed political, and sometimes cultural domination also on these colonies of south east Asia.