The Transatlantic Slave Trade and Colonization: Two Troublesome Topics. Talking about the slave trade and colonialism continues to be a burden for most countries in the world. And yet these are subjects that need to be discussed so that the collective conscience knows much more about the other side of history that has been kept silent. On the contrary, the imperialist narratives are the most popular, reinforcing nationalist feelings and problems related to racism. In Portugal, this discourse is slowly gaining ground and constitutes a real philosophy that a part of the population cannot get rid of.