Comparing to EU and USA only China has provided very much support for development in Africa and has by doing so indirectly helped to limit the desire to may way to Europe. But the peak of migration is not reached.
Given the imminent increase of US military "Black-Ops" to contain Chinese investments in Africa is playing hand in hand with US protection tariffs against China. The budget for USAFRICOM could be spend more effectively then for obstructions like training extremist groups. Its all about natural resources and not humanitarian consideration...
If the next wave of migration starts next year it is Europe which has to carry the burden of migration when African countries are turned into rubble like Libya, Somalia etc... So the EU's hope to relax the thread of yet more migration influxes is just based on added flexibility provided by the "Emergency Trust Fund for Africa" to provide a new impulse to migration cooperation with North African countries, especially Egypt, Morocco, and Tunisia its in my opinion not going to work out.
If Sub-Saharan African countries are not directly included in talks with the EU, all the US need to do is to continue to obstruct and to create insecurity, either deliberately or out of stupidity. Egypt, Morocco, and Tunisia have to negotiate with Sub-Saharan African countries because these Sub-Saharan countries tend to rely heavily on remittances from diaspora communities in Europe, so reluctant to cooperate. Who wants to live in a country where social instability is the norm?
I really recommend for more on changing migration trends and EU migration policy, see Lisa Watanabe’s latest addition to the CSS Analyses in Security Policy series.