You cannot board a flight to Kenya without either of the following: 

1. US passport and Kenyan valid passport. 

2. Greencard and Kenyan valid passport.  

3. US passport and eVISA. 

4. Greencard and  emergency travel document. 

5. Valid Kenyan passport for visitors and students.
Everyone is required to have a negative COVID-19 test valid not more than 96hrs. We recommend a PCR test and not a rapid test. 

APPLY FOR eVISA at http://evisa.go.ke/evisa.html.
 For more visit the Kenya Embassy website at https://kenyaembassydc.org/
 Remember to check your passport expiration date. 
You can now file your US citizenship online at https://www.uscis.gov/n-400.  
If you have any question or need an immigration lawyer, check with us at www.vitendo4africa.org