Conditional cash transfers (CCTs) are a striking case of policy diffusion in Latin America. Almost all countries in the region adopted the model within one decade. While most theories of diffusion focus on the international transference of ideas, this article explains that surge of adoptions by analyzing presidents’ expectations. Out of all ideas transmitted into a country, only a few find their way into enactment and implementation, and the executive has a key role in selecting which ones. Policies expected to boost presidents’ popularity grab their attention. They rapidly enact and implement these models. A process-tracing analysis comparing CCTs and public-private partnerships (PPPs) shows that presidents fast-tracked CCTs hoping for an increase in popular support. Adoptions of PPPs, however, followed normal procedures and careful deliberations because the policy was not expected to quickly affect popularity—which, in the aggregate, leads to a slower diffusion wave.

The Great Migration fundamentally reshaped Northern electorates. Millions of Black voters, who had been unable to vote in the South, became eligible to vote through their resettlement in the North. In many instances, parties and politicians believed that Black voters were the balance of power in elections. This belief led them to change their approaches and make specific appeals to Black voters in an effort to win their support. Although scholars of American politics have revised the dominant narrative about the development of the Democratic Party on issues related to race, they fail to account for the role of Black voters in contributing to the Party’s change. The goal of this work is to describe how the Great Migration influenced Democratic Party interactions with Black voters in presidential elections from 1948–1960. I argue that increasing competition between the Democratic and Republican Parties, coupled with Black migrants’ location in electorally important states, made Black voters an important target of presidential campaign strategy in the post-war era.