ENThis thesis provides the first continuous GDP per capita estimates for Lithuania, Latvia, and Estonia for 1919–1995 and, by splicing the series with existing data, offers the first set of national accounts for the Baltic states covering 1913/1919–2024. By gathering and utilising extensive primary archival and published data as well as drawing on new and existing benchmark GDP figures, the study produces detailed output-side estimates which allow for sectoral analysis of Baltic economic growth. The figures are converted into international dollars, ensuring full comparability with existing Maddison Project Database data. By accounting for the occupied Baltic republics under Soviet rule, this research also constitutes the first attempt at long-run regional national accounting for individual republics within the USSR, offering a framework for other countries such as Ukraine or Belarus. With the new data the thesis fills a long-standing gap in European historical national accounting and enriches the comparative study of peripheral economic catch-up across the capitalist–socialist divide. It contributes three new case studies that shed light on long-term growth dynamics in the European periphery. The findings reveal severe economic devastation in Lithuania and Latvia following the First World War, placing them among Europe’s hardest-hit regions. Recovery was slow, hampered by post-war independence struggles and the collapse of pre-war economic integration with imperial Russia. The 1920s proved disappointing: growth in Latvia and Estonia merely matched that of advanced economies, while Lithuania entered a prolonged recession after the 1923 annexation of the Klaipėda region. By contrast, the 1930s brought resilience in the face of the Great Depression, likely due to continued reliance on primary rather than processed goods exports.During the last decade before 1940 all three republics experienced rapid, state-supported, industrialisation-driven growth fuelled by internal demand. As a result, while Lithuania remained firmly in the periphery, Latvia—and to some extent Estonia—retained their positions among the best-placed peripheral economies before the Second World War. The war again brought demographic catastrophe and economic collapse. Under Soviet occupation, the 1950s and 1960s were marked by rapid industrial growth, mirroring the USSR’s post-collectivisation boom and enabling the Baltic republics to narrow the gap with advanced economies. By the early 1970s, however, the European post-war boom had ended, and socialist economies—including the Baltics—slowed more sharply than their capitalist counterparts. Growth in occupied Latvia and Estonia weakened from 1968 onwards, never again outpacing the Western core until the mid-1990s. Lithuania maintained momentum until the mid-1970s before following a similar path of stagnation and relative decline. A comparative sectoral analysis shows that the transition from agriculture to industry and services was faster during the interwar capitalist period than under Soviet rule. The socialist focus on heavy industry appears to have constrained consumer goods production and limited living standards. By 1989, Latvia and Estonia had lost their earlier relative positions within Europe; Lithuania had narrowed its historical gap in GDP per capita terms but still lagged far behind the West. The post-1991 transition brought dramatic reversals. Latvia had already been in decline since 1987 and suffered perhaps the most severe post-Soviet contraction of all, erasing its historical income lead.Estonia endured a much milder recession and maintained its advantage until 2019, when Lithuania, having lagged behind its northern neighbours for more than a century, became the richest of the three Baltic economies following exceptional post-2010 growth. By 2024, Lithuania leads, followed by Estonia, with Latvia significantly behind. The long-run perspective shows that, despite occasional periods of strong performance—notably in the late 1930s, the 1950s–1960s, and the post-1990 independence era—the Baltic states have remained within Europe’s economic periphery. Neither interwar capitalism nor post-war socialism and Soviet occupation succeeded in substantially closing the gap with advanced economies. Modern independence has brought notable catch-up progress, but in recent years Latvian and Estonian growth has stagnated, while Lithuania remains on a positive convergence track. By 2023, GDP per capita in all three countries still stood at only 63–77% of the Western core average and 55–67% of the Nordic level. The thesis also examines the possible drivers and constraints of Baltic growth across political regimes. In the interwar years, growth was largely driven by automatic convergence stemming from Baltic ‘advantages of backwardness’, though institutional developments of the 1920s and 1930s potentially played a role as well. Under socialism, early gains stemmed from capital accumulation, labour reallocation, Soviet technology transfer, and exploitation of scale economies in the USSR’s planned economy—enabled by inherited ‘social capabilities’ and largely coercive Soviet policies. [...] Keywords: interwar growth, historical national accounting, Latvian GDP, Baltic GDP, Estonian GDP, Lithuanian GDP, socialist growth.