What do you see in this cartoon ? or what is happening ?

Okay from what I see it's someone leaving the US.  the bag says undesirable. and Undesireable means unwelcome. so they are an immigrant leaving the US because they were unwelcomed and by the caption, it says Close the gate. So I believe it means to close the "border" to prevent any immigrants from coming into the US.

Explanation:

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°