An example of fill in the blank pan, Africanism apartheid genocide Arab springs is when many different Niagara, an ethnic groups, organize the oppose British rule

An example of the fill in the blank can be:

An example of pan-Africanism, apartheid, genocide, and Arab springs is when many different ethnic groups, like the Zulu, Xhosa, Sotho, and various others, organized to oppose British rule in South Africa during the apartheid era.

An example of fill in the blank is when many different Niagara, an ethnic groups, organize the oppose British rule

pan Africanism
apartheid
genocide
Arab springs

An example of the fill in the blank can be:

An example of pan-Africanism, apartheid, genocide, and Arab springs is when many different ethnic groups, such as the Xhosa, Zulu, and Sotho, organized to oppose British rule in South Africa during the apartheid era.

An example of a fill in the blank phrase that fits the provided context is "The Arab Spring," where many different ethnic groups organized to oppose British rule.

The Arab Spring refers to a series of uprisings and protests that swept across several Arab countries in North Africa and the Middle East, beginning in late 2010. It was primarily a movement against authoritarian regimes, corruption, and socioeconomic inequality. People from different ethnic backgrounds came together to demand political reforms and better living conditions.

Please note that the other words in the initial question, such as "pan, Africanism, apartheid, genocide, and Niagara," do not directly relate to the given context and may not fit logically into the example.