I stand in solidarity with the black lives matter movement.
It is not enough to stand in solidarity without accountability and actions towards change. Us, as mathematicians, we must continuously and actively work towards diversifying mathematics which has been historically (and continues to be) comprised mainly of white cishet men and we must acknowledge the racism present throughout mathematics. We must work towards ending institutional and systemic racism in our departments, work to promote and hire more underrepresented minorities and to encourage and support young mathematicians from underrepresented communities. This must be done by everyone; the burden must not be placed on underrepresented minorities. If you can, I'd also highly encourage donating to Mathematically gifted and black or The algebra project. Mathematics is for everyone.