In these essays, I study the long-term effects of education policies and birth order on educational and labor market outcomes. In my first chapter I study the long-term effects of one of the first early education programs in the US - the Kindergarten Movement (1890-1910). I collected unique data on the opening of public kindergartens across cities in the US during this period. I then link over 100,000 children living in these cities to subsequent Censuses where their adult outcomes can be observed. I find that kindergarten attendance had large effects on adult outcomes. On average, the affected cohorts had about 0.6 additional years of schooling and six percent more income (as measured by occupational score). These effects were substantially larger for second generation immigrant children. The effects of this early intervention are most likely due to language acquisition and the attainment of various "soft skills" early in childhood. The second chapter was co-authored with Maria Laura Alzua and Leonardo Gasparini, who directed the project. In this chapter, we study the long-term effects of an educational reform in Argentina. In the nineties Argentina implemented a large education reform that mainly implied the extension of compulsory education in two additional years. The timing in the implementation substantially varied across provinces, providing a source of identification of the causal effects of the reform. The estimations from difference-in-difference models suggest that the reform had a positive impact on years of education and the probability of high school graduation. The impact on labor market outcomes was positive for the non-poor youths, but almost null for the poor. In my third chapter I use US historical data to empirically test whether long-term birth order effects differ across the leading and lagging regions of the country in the Pre-War World II period. To do so, I create a large panel dataset by linking more than two million children across the 1920 and the 1940 full census counts, and to the World War II army enlistment records. I then study birth order effects on various long-term outcomes (with emphasis on educational outcomes). I find that in general, birth order effects are positive in the "developing" south--i.e. younger siblings do better than older siblings-- and negative in the relatively modern north, which is consistent with the available evidence from contemporary data for developed and developing countries. I then exploit state level variation to show that birth order effects are positively correlated with the share of rural population, child labor rates and negatively correlated with the level mechanization in agriculture. I also show that, regardless the state of birth, the effects tend to be larger for the poor. Finally, I complement the analysis by looking at birth order effects on earnings and adult height. While I find relatively similar results for earnings, I find no birth order effects on adult height, which suggests that we can rule out improvements in health or nutrition as the potential mechanisms behind the effects on education and labor outcomes.