High Quality Content by WIKIPEDIA articles! Despite having an old alliance with Britain dating back to the Treaty of Windsor in 1386 (the oldest alliance in the world, which is still in force), Portugal did not initially form part of the system of alliances involved in World War I and thus initially kept its neutrality. However, tensions between Germany and Portugal arose due to German U-Boat warfare which sought to blockade the United Kingdom — at the time the most important market for Portuguese products. Clashes also occurred with German troops in the south of Portuguese Angola in 1914 and 1915 (see German campaign in Angola). Данное издание представляет собой компиляцию сведений, находящихся в свободном доступе в среде Интернет в целом, и в информационном сетевом ресурсе "Википедия" в частности. Собранная по частотным запросам указанной тематики, данная компиляция построена по принципу подбора близких информационных ссылок, не имеет самостоятельного сюжета, не содержит никаких...