1.0National History Dayhttps://nhd.org/esNHD Openboxrich600338<blockquote class="wp-embedded-content" data-secret="AqhgGGxIc3"><a href="https://nhd.org/es/contest/theme/">Tema</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://nhd.org/es/contest/theme/embed/#?secret=AqhgGGxIc3" width="600" height="338" title="«Tema» — National History Day" data-secret="AqhgGGxIc3" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://nhd.org/wp-includes/js/wp-embed.min.js </script>https://nhd.org/wp-content/uploads/2026/06/NHD_2027ThemeBookGraphics_112125_NHD_2027ThemeBookGraphics_FB_WithText-scaled.jpg25601246The theme for National History Day® (NHD) 2027 is Innovation in History: Impact, Influence, Change. Innovation goes beyond creating new tools or devices to finding new ways of thinking, organizing, and influencing society. To put it simply, innovation, at its core, is about change and the impact of that change. To fully explore innovation in a historical context, we must look beyond the idea itself and examine its effects. How did people, over time, imagine, develop, and implement new ideas, technologies, or methods? And in what ways did those innovations influence societies? The following resources are available to start defining your topic and begin your research.