European colonialists were illegal migrants

In the 18th and 19th centuries, many Europeans arrived in Africa, and elsewhere, as ‘illegal migrants’ — without invitation or papers — and forced the natives to accept them at gunpoint.
The same Europeans settled in those countries, plundered their wealth and exploited their peoples. One wonders what the reaction would be if Somalis or Libyans arrived now in the south of France or Germany, armed to the teeth, planted their flag and took over?