Every death by Dutch capitalism (death from the slave trade, Colonialism/Colonial wars (Oceania, Africa, …), …)
plus
Every death by British empire’s capitalism (Irish genocide, Bengal famine, Slave trade, Colonialism/Colonial wars (India, Africa, North America, South east Asia, Oceania, Middle east, …) , Opium wars, Massacres against independence movements (India, …), …)
plus
Every death by French capitalism (Colonialism/colonial wars (North America, Caribbeans, Africa, South east Asia, …), Slave trade, Massacres against independence movements (Algeria, Haiti, …), …)
plus
Every death by Belgian capitalism (Colonialism/Colonial wars (Congo, …), Slave trade, Massacres against independence movements, …)
plus
Every death by United States’ capitalism (Colonialism/Colonial wars (Cuba, Hawaii, Philipines, North America, …), Massacres against independence movements (South east Asia, Oceania, Cuba, …), Slave trade, …)
plus
Every death by German capitalism (Nama and Herero genocide, Holocaust, Slave trade, …)
plus
Every death caused by preventable starvation, lack of access to water, healthcare.
List very much non-exhaustive.
If you add it all up you easily get over 1 Billion.
Most books by Ha-joon Chang, especially 23 things they don’t tell you about capitalism. Fun fact, Ha-joon Chang isn’t a Marxist, he’s a liberal, but his writing is still critical enough of capitalism that South Korea banned his books.
Anything on prolewiki’s library are good reads as well.
For a broad look at the evolution modes of productions and how capitalism came to be there is this 60s textbook from the soviet academy of science, there even are a series of videos following the textbook by the finish bolshevik that is pretty good.