 Complete the following phrase:  To gain the revenues of Congolese resources, Mobutu initially nationalized foreign-owned firms and forced European investors out of the country. But in many cases he handed the management of these firms to relatives and close associates, who quickly exercised their own corruption and stole the companies assets. By 1977, this had precipitated such an economic slump that Mobutu was forced to try to woo foreign investors back. Katangan rebels based in Angola invaded Zaire that year, in retaliation for Mobutus support for anti-MPLA rebels. France airlifted 1,500 Moroccan paratroopers into the country and repulsed the rebels, ending 