Over the years, I've found a lot of really great articles and resources that explain various social justice issues around the world. Rather than trying to reinvent the wheel, I am linking to some of my favorites here, including ones that I used to inform my writing of my novel.

On Diversity in Writing Fiction:

Writing with Color

Springhole

No, Authors Should Not Be Constrained by Gender or Race in the Characters They Create

Diversity, Political Correctness, and the Power of Language

General Refugee Activism and Support:

UNHCR: Figures at a Glance

Needs List

Local Philadelphia Refugee and Immigrant Non-Profit Organizations:

HIAS

Nationalities Service Center

Southeast by Southeast

The Philadelphia Office of Adult Education

Garces Foundation

Slavery in Mauritania:

Slavery's last stronghold.

The abolitionist fighting to free Mauritania's slaves. 

The Civil War and Rebuilding Efforts in Liberia:

BBC Country Profile on Liberia

The War Lords of Liberia (Vice Documentary)

Iraqi Translators and Special Immigrant Visas:

A list of Iraqi national casualties of the Iraq war (not sure if it's up-to-date)

Thousands of Iraqi translators who worked for American troops live in fear

John Oliver on Iraqi Translators

The Lhotsampa People of Nepal:

An excellent interactive about the Lhotsampa and the refugee resettlement process in general

Local Racial Justice Groups:

SURJ: Showing Up for Racial Justice