How did the 1966 coups change Nigeria’s government and deepen ethnic divisions?

The 1966 coups fundamentally transformed Nigeria’s government and severely exacerbated existing ethnic tensions. In January 1966, a group of army officers attempted to overthrow the federal government, resulting in the deaths of Prime Minister Abubakar Tafawa Balewa and two regional premiers. This led to a military administration under Maj. Gen. Johnson Aguiyi-Ironsi, who sought to replace the federal system with a unitary government.12

These events deepened ethnic divisions in several ways:

• Perception of Bias: The January coup leaders were accused of favoring Igbo domination, which triggered anti-Igbo riots in the north.12
• Military Fragmentation: The army split along ethnic lines as officers clashed over power, undermining national unity.12
• Countercoup and Violence: In July 1966, northern officers staged a countercoup, assassinating Aguiyi-Ironsi and bringing Yakubu Gowon to power. This transition was followed by widespread intercommunal clashes and ethnic massacres, which ultimately pushed the country toward the Nigerian Civil War.12

The instability caused by these coups effectively dismantled the post-independence constitutional order and set the stage for the secessionist movement in the Eastern region.12