That's during a four-country African tour that has focused in part on the entwined issues of security and Russia's growing influence in the region.
The U.S., Britain and others have long been Nigeria's allies in its battle against insurgents including Boko Haram.
Speaking alongside his counterpart Yusuf Tuggar on Tuesday (January 23), Blinken extended his condolences to the victims of recent attacks.
"As I told the president and foreign minister, the United States will support Nigeria as it works to bring a more secure, a more peaceful and a more prosperous future for its people."
Blinken's tour has largely been focused on West Africa, where costly, internationally-backed military efforts have struggled to contain rising jihadist militancy.
The increased insecurity has, in part, fuelled several coups.
For Western powers, thats also prompted fears of Russia's expanding influence.
In Mali, for example, the junta booted French troops out and brought in Russian mercenary group Wagner.
Niger, a key U.S ally against Sahel militants, has also kicked out French troops and severed security pacts with the European Union.
Last week Russia said it had agreed to develop military cooperation with Niger.
''Nigeria offers real clear compelling opportunities for investors."
In Nigeria, Blinken also discussed long-term barriers to investment in Nigeria, including corruption and the repatriation of capital.
Africa's biggest economy has about $7 billion in forex forward that have matured.
That's a major concern for investors as foreign currency shortages weigh on the naira, despite central bank assurances to clear the backlog.
