The answer depends on the country in question. They have had an impact on the Americas since the time of Columbus. Their impact has become significant in many countries at many different times over the last several centuries.
It is projected that Hispanics will become the largest minority group in the US by 2060, according to the US Census Bureau's estimates. Their population growth is driven by high birth rates and immigration patterns.
The largest minority group in the US is Latino.
African Americans have always been a significant group even when they were not treated as such. African American's helped build this country and made great contributions making them as notable as any other ethnic group.
For someone to know when the minority group became significant or notable they would have to k own what the minority groups are. Not knowing why the groups are will not allow them to know this.
Hispanics are the fastest growing minority group in the US.
The two largest minority groups in the US are Hispanics/Latinos and African Americans.
Minority Group
The largest minority group in the country today is Hispanics or Latinos, accounting for about 18% of the U.S. population.
There are over 60 million Hispanics in the United States. There are about 24 million blacks. The Hispanics will continue to grow as most are Catholics and do not believe in family planning or birth control. The Hispanics are by far the largest minority in this country. There is another 12 million undocumented Hispanics. In 20 years, there will be over 75 million Hispanics and it will be wise to learn Spanish.
African-Americans 12-14% is the largest racial minority, though Hispanics are largest ethnic minority, being Hispanic is not a race. It just refers to the those who are from one the former Spanish colonies.
Asians followed by Italians then Greeks/lebonese.. Alot more Hispanics and sudanese immigrants lately though
Eastern Orthodox, although there is a significant catholic minority as well.